Electromechanical device.



G. H. ROWE. ELEOTROMBGHANIGAL DEVICE.

APPLICATION FILED.00T.17, 190B.

Patented Oct. 18,1910.

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ornrn STATES Parana GEORGE H. ROWE, OF IBERWYN, ILLINOIS, ASSIGNOR TO ELECTBJO-IEAGNETIG TOOL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

ELECTEOMECI-IANICAL DEVICE.

To all whom it may concern:

Be it known that I, GEORGE H. Rown, a citizen of the United States, residing at Berwyn, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Electromechanical Devices, of which the following is a specification.

.1 invention relates to an electro-mechanical device comprising two reciprocating parts, one of which is moved by the application of mechanical force and the other by means of the magnetic attraction between said parts. A device of this character is shown and described in my Patent No. 894,782 dated July 28, 1908.

The object of the present invention is to make a new application of the principle involved in my previous invention together with new and improved arrangements of the coil, field core or pole pieces and armature core.

More specifically, my invention has for an object to provide an iron to iron contact between the field core or pole pieces and armature, thus minimizing the air gap in the magnetic circuit. This gives a stronger attraction between the magnet and its armature and enables me to make the device much lighter and more compact than hereto fore and get the same results.

The invention has for a further object to make it possible to employ a stationary coil and reciprocate only the pole pieces or field core, which economizes driving force.

A further object of the invention is to adapt my electro-mechanical device to use in a riveter or the like, combining within the small compass of a portable riveter adapted to be used by hand the coil, plunger armature and field core, together with a motor for reciprocating the latter.

The invention has for further objects such new and improved constructions, arrangements and devices iirelectro-mechanical devices and in riveting apparatus and the like, as will be described in the following specification and particularly set forth in the claims appended thereto.

The. invention is illustrated, in a typical embodiment, in the accompanying drawings, in which Figure 1 is a longitudinal, sectional view through a riveter constructed in accordance Specification of Letters Patent.

Application filed October 17, 1908.

Patented Oct. 18, 1910..

Serial No. 458,305.

with my invention; and Fig. 2 is a section on line 22 of Fig. 1.

Like characters of reference indicate like parts in the several figures of the drawings.

Referring to the drawings, t represents the casing of the riveter having the usual handle 5.

6 is the rivet-set having the head 7 to retain it in place and the spiral spring 8 abutting against a collar 9. The full line position shows the rivet-set when the device is idle. It will be understood that, when in use, the rivet-set is forced back into the dotted line position by contact with the rivet.

Within the casing is the magnetizing coil 10, which maybe of any desired type and which is shown as wound upon the brass spool 11. The coil may be energized from any desired source of current. The latter is not shown, nor the connections from it to the coil, as these parts form, in themselves, no part of my invention. Slidable within the spool 11 is a cylindrical device which I have termed the field core, and which consists of the soft iron pole-pieces 12, 13, joined together by a non-magnetic, central ring 1%, preferably made of brass. This field core will be magnetized when coil 10 is energized, the magnetic circuits being completed through the iron rings 15 and 16, the iron cylinder 17, which together constitute an iron yoke around the coil, and through the pole pieces 12, 1 3 and armature 18. The latter is shown in the form of a plunger, made preferably of soft iron and accurately turned, so as to work smoothly in, but with as close contact with, the field core as is possible. To the iron armature 18 is attached the non-magnetic extension 19, which is driven against the head 7 of the rivet-set in the operation of the riveter.

In the upper part of the casing is located a motor, preferably the electric motor 20, which may be supplied with current from any desired source. The shaft of this motor is provided with the bevel gear 21, which meshes with a bevel gear 2 on a shaft 23, provided with the cranks 2a, 25, connected by pitmen 26, 26, to the field core. Reciprocating motion is thus mechanically imparted to the latter.

Preferably the device will be constructed so as to obtain an iron to iron contact between the plunger and the field core, as it has been termed. In some cases it may not be desirable to employ a soft ironplunger against the soft iron pole pieces in the field core, as there will be a tendency for the parts to stick together too much when both are made of soft iron and in immediate contact, and also a tendency to wear too much. In such cases the surface of one or other or both of the contacting parts may be hardened, as, for example, by being chilled, or may be treated with some substance which will at once give a hardened wearing surface and decrease the magnetic permeability of the parts at such places. For example, the plunger may be superficially treated with manganese or nickel, or it may be constructed with a thin, superficial sheet or film of manganese or nickel steel. In this way there will be little or no superficial attraction between the plunger and pole-pieces while, at the same time, a harder wearing surface will be obtained.

The operation of the device is as follows: When current is supplied to motor 20 and to magnetizing coil 10, the field core is reciprocated and its pole-pieces 12 and 13 magnetized. The magnetic attraction between the pole pieces in the field core and the armature plunger within the same carries the plunger along with the core. There will, however, be some slip between the core and plunger at the end of each stroke in each direction, or in other words, the mag netic attraction of the core for the armature will constitute what may be termed a magnetic spring or cushion between the parts. The result of this is that there will be lit tle or no shock upon the driving apparatus or other parts of the machine.

In my former patent I propose to use the brass cylinder surrounding the iron plunger armature commonly used in the construction ofsolenoids. This brass cylinder coming between the iron of the plunger and the pole-pieces of the field core makes gaps in the magnetic circuit weakening the attractive force exerted upon the plunger. My present invention does away with this insulating device and makes an iron to iron contact between the plunger and the field core. This enables me to make my device much lighter, both because of the elimination of the weight of the insulating cylinder and also because of the increased strength of the magnetic attraction upon the plunger due to minimizing the gap in the magnetic circuit. The brass cylinder is necessary in ordinary solenoids in order to give a free, sliding movement of the plunger. Too much freedom of movement between the plunger and magnet is not desirable in my device, in which the function of the magnetic attraction is to produce a cushion or spring between the slidably engaging parts of a striking device. I also increase the lightness and efiiciency of my device in its preferred form by making the coil stationary and reciprocating pole-pieces.

The parts 12 and 13 constitute pole-pieces which extend for some little distance into the coil. Thus the places of contact between the armature and the parts of the magnetic circuit associated with the coil where the lines of force go from one to the other are within the coil where the magnetic leakage is least and the magneto motive force is greatest. This increases the attractive force exerted upon the armature or striking member.

I do not claim specifically herein, a hardening of the contacting surfaces of plunger 18 and pole pieces 12, 13 by the process of chilling or case hardening, as this is specifically claimed in my Patent N 0. 938,709, the application for which was copending with the present application.

I claim:

1. The combination with a stationary magnetizing coil and a field core adapted to be reciprocated within said coil, of an armature arranged to be actuated by the movement of said core, and means for reciprocating said field core.

2. The combination with a coil, of a field core slidable within the coil, an armature slidable within the field core, and means for reciprocating one of said two last-mentioned members.

3. In an electrosmagnet, the combination with a magnetizing coil, of pole pieces slidable within the coil, an armature slidable within the pole pieces, and means for recip rocating the pole pieces.

4:- The combination with a coil, of a iron yoke surrounding the coil, a field core slidable within the coil and in contact with parts of the iron yoke, an armature within said field core, and means for reciprocating the field core.

5. The combination with a coil, of an iron yoke surrounding said coil, said iron yoke comprising a cylinder surrounding the coil and connecting with iron rings at the ends of the coil; a field core mounted within said coil, said field core comprising a cylinder, the ends of which are iron pole pieces in slidable contact with said iron rings, an iron plunger within said field core and constituting an armature therefor, and means for reciprocating the field core within the coil.

6. The combination with a casing, of a magnetizing coil within said casing, a field core within said coil, a plunger constituting an armature within said field core, one of said last two mentioned members being provided with a striking part, and means carried by said casing for reciprocating the other of said two members.

7. The combination with a casing, of an electro-magnet in said casing comprising a stationary coil, a movable field core within 1 said coil, an armature within said core, said 5 armature constituting a plunger and being provided with a striking part, and a motor adapted to reciprocate said field core.

8. In an apparatus of the character described, the combination with two relatively movable, contact-ing magnetizable parts, the contacting surface of one of said parts being hardened, ot' means for magnetically energizing one of said parts whereby the movement of such part will actuate the other of said parts.

9. In an apparatus of the character described, the combination with two relatively movable, contacting magnetizable parts, the contacting surface of one of said parts being hardened by treatment whereby it is made to have less magnetic permeability than the center of the same, of means for magnetically energizing one of said parts whereby the movement of such part will actuate the other of said parts.

10. In a riveter, the combination of a casing, a rivet set, a plunger having a magnetic part and a non-magnetic, striking portion, a field core surrounding said plunger, a coil surrounding the field core, and a motor with-' in the casing adapted to reciprocate the field core.

11. In a riveter, the combination of a mag netizing coil, a field core within the field of said coil, a magnetically actuated plunger within said field core, a rivet set, means arranged to reciprocate said field core whereby said plunger will be caused to strike said rivet set, and means for supporting and connectin said parts in their proper relation to each other.

12. An electro magnetic device comprising a magnetizing coil, pole pieces and an armature, said pole pieces and armature being relatively movable, the adjacent surfaces of said movable parts being hardened by treat ment whereby they are made to have lower magnetic permeability than the other parts of said elements.

13. The combination with a magnetizing coil, of pole pieces and an armature, said pole pieces and armature being movable with respect to each other and with respect to the coil, and means for reciprocating one of said movable members.

14,-. The combination with a magnetizing coil, of pole pieces extending inwardly into the coil, an iron yoke connecting said pole pieces, an armature connecting said pole pieces, said armature and pole pieces being movable with relation to the coil, and means for reciprocating one of said movable elements.

15. In apparatus of the character d-e scribed, the combination with two paramagnetic bodies, one being arranged to slide within the other, means for reciprocating one of said bodies, and stationary means for producing magnetic attraction between said bodies.

16. In apparatus of the character described, the combination with two paramagnetic bodies, one being slidable in immediate contact with the other, means for reciprocating one of said bodies, and stationary means for producing magnetic attraction between said bodies.

17. In apparatus of the character described, the combination with two paramagnetic bodies, one being slidable within the magnetic influence of the other, means for reciprocating one of said bodies, and a stationary magnetizing coil for producing mag' netic attraction between said bodies.

18. In apparatus of the character described, the combination with two paramagnetic bodies, one being slidable within and in immediate contact with the other, means for reciprocating one of said bodies, and means for producing magnetic attraction between said bodies, the contacting surface of one of said bodies being harder than the center thereof.

19. The combination with a stationary magnetizing coil and a field core adapted to be reciprocated within said coil, of an armature arranged to be actuated by the movement of said core, means for reciprocating said field core, and means associated with said stationary magnetizing coil which with said core and armature forms a closed magnetic circuit.

20. In an electro-magnetic device, the combination with a magnetizing coil, of pole pieces slidable within the coil, an armature slidable within the pole pieces, means for reciprocating the pole pieces, and means associated with said magnetizing coil which with said pole pieces and armature forms a closed magnetic circuit.

21. In apparatus of the character described, the combination with two paramagnetic bodies, one being within the magnetic influence of the other, means for reciprocating one of said bodies, a stationary magnetizing coil for producing magnetic attraction between said bodies, and means associated with said coil which with said bodies forms a closed magnetic circuit.

22. In apparatus of the character described, the combination with two paramagnetic bodies, one being avithin the magnetic influence of the other and comprising pole pieces spaced apart, means for reciprocating one of said bodies, and a stationary magnetizing coil for producing magnetic attraction between said bodies.

23. In apparatus of the character dc scribed, the combination with two paramagnetic bodies, one being within the magnetic influence of the other and comprising pole pieces spaced apart, means for reciprocating scribed, the combination with a hollow reone of said bodies, a stationary magnetizing l coil for producing magnetic attraction between said bodies, and means associated with said coil which, with said bodies, forms a closed magnetic circuit.

2%. In apparatus of the character described, the combination with a hollow reciprocatory element, means to reciprocate the same, an impact element movably mounted within said hollow element, and a fixed magnet surrounding said element and influencing the impact element to cause it to move in unison with said hollow element.

25. In apparatus of the character deciprocatory element, comprising pole pieces spaced apart, means to reciprocate the same, an impact element movably mounted Within said hollow element and having parts in proximity to said pole pieces, and a fixed magnet operated through said pole pieces to couple the reciprocatory element and the impact element so as to cause them to be moved in unison.

GEORGE H. RONE.

lVitnesses:

P. H. TRUMAN, H. L. PEoK.

Correction in Letters Patent No. 973,216.

It is hereby certified that in Letters Patent N o. 97 3,216, granted October 18, 1910, upon the application of George H. Rowe, of Berwyn, Illinois, for an improvement in Electromechanical Devices, an error appears in the printed specification requiring correction as follows: Page 2, after line 79, the following paragraph should be inserted:

It will be observed that while broadly I have shown a structure in which a magnet has an iron to iron contact with its armature in such manner that the magnet and the armature may be relatively reciprocated, the specific form of magnet shown, to which specific form, however, my generic invention is not limited, consists of a magnetizing coil inclosed within an iron yolee on three sides and inclosed on its fourth side by a field core which, in turn, is shown specifically as composed of two cylindrical pole pieces which are capable of being reciprocated within the solenoid and which contact with the armature. and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 29th day of November, A. D., 1910.

[SEAL] E. B MOORE,

Commissioner of Patents It is hereby certified that in Letters Patent No. 973,216, granted October 18, 1910, upon the application of George H. Rowe, of Berwyn, Illinois, for an improvement in Electromechanical Devices, an error appears in the printed specification requiring correction as follows: Page 2, after line 7 9, the following paragraph should be inserted:

It will he observed that while hroaolly I /I.6ll)6 shown a structure in which a magnet has an iron to iron contact with its armature in such manner that the magnet and the armature may he relatively reciprocatecl, the specific form of magnet shown, to which specific form, however, my generic invention is not limited, consists of a magnetizing coil inclosecl within an iron yohe on three sides and incloseol on its fourth side 6 a fielol core which, in turn, is shown specifically as composed of two cylindrical pole pieces which are capable of heing reciprocated within the solenoid and which contact with the armature.

and that the said Letters Patent should he read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 29th day of November, A. D., 1910.

[SEAL] E. B. MOORE,

Uommissioner of Patents 

